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Encyclopedia > Mesosphere

The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere. The mesosphere is located about 50-80/85km above Earth's surface. Within this layer, temperature decreases with increasing altitude. The main dynamical features in this region are the atmospheric tides which are driven by momentum propagating upwards from the lower atmosphere and extending into the lower thermosphere. Layers of Atmosphere (NOAA) Air redirects here. ... Atmosphere diagram showing stratosphere The stratosphere is a layer of Earths atmosphere that is stratified in temperature, with warmer layers higher up and cooler layers farther down. ... The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ... Earth (IPA: , often referred to as the Earth, Terra, or Planet Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... Altitude is the elevation of an object from a known level or datum. ... The tide is the cyclic rising and falling of Earths ocean surface caused by the tidal forces of the Moon and the Sun acting on the Earth. ...

Atmosphere diagram showing the mesosphere and other layers. The layers are not to scale: from Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius.
Atmosphere diagram showing the mesosphere and other layers. The layers are not to scale: from Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius.

Because it lies between the maximum altitude for most aircraft and the minimum altitude for most spacecraft, this region of the atmosphere is only directly accessible through the use of sounding rockets. As a result the region is one of the most poorly understood in the atmosphere. This has led the mesosphere and the lower thermosphere to be jokingly referred to by scientists as the ignorosphere[1][2]. Image File history File links Atmosphere. ... Image File history File links Atmosphere. ... An Airbus A380, currently the worlds largest airliner An aircraft is any vehicle or craft capable of atmospheric flight. ... A spacecraft is a vehicle, vessel, craft or device designed to operate beyond the surface of the Earth in outer space. ... A sounding rocket, sometimes called an elevator research rocket, is an instrument-carrying suborbital rocket designed to take measurements and perform scientific experiments during its flight. ...


Temperatures in the upper mesosphere fall as low as -100°C (-146°F or 173 K)[3], varying according to latitude and season. Millions of meteors burn up daily in the mesosphere as a result of collisions with the gas particles contained there, leading to a high concentration of iron and other metal atoms. The collisions almost always create enough heat to burn the falling objects long before they reach the ground. The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero—the lowest possible temperature where nothing could be colder and no heat energy remains in a substance—is defined as zero kelvin (0 K). ... Latitude, usually denoted symbolically by the Greek letter φ, gives the location of a place on Earth north or south of the Equator. ... A season is one of the major divisions of the year, generally based on yearly periodic changes in weather. ... Photo of a burst of meteors with extended exposure time A meteor is the visible path of a meteoroid that enters the Earths (or another bodys) atmosphere, commonly called a shooting star or falling star. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ...


The stratosphere and mesosphere are referred to as the middle atmosphere. The mesopause, at an altitude of about 80 km, separates the mesosphere from the thermosphere—the second-outermost layer of the Earth's atmosphere. This is also around the same altitude as the turbopause, below which different chemical species are well mixed due to turbulent eddies. Above this level the scale heights of different chemical species will differ. The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ... The turbopause marks the altitude in the Earths atmosphere below which turbulent mixing dominates. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


Noctilucent clouds are located in the mesosphere. Noctilucent clouds (also known as polar mesospheric clouds) are rare bright cloudlike atmospheric phenomena visible in a deep twilight (the name means roughly night shining). They are most commonly observed in the summer months at latitudes between 50° and 60° (north and south). ...


See also

Earth's atmosphere Layers of Atmosphere (NOAA) The Karman Line is an internationally designated altitude commonly used to define outer space. ... Layers of Atmosphere (NOAA) Air redirects here. ...

  Troposphere | Stratosphere | Mesosphere | Thermosphere | Exosphere   The Troposphere is the lowermost portion of Earths atmosphere. ... Atmosphere diagram showing stratosphere The stratosphere is a layer of Earths atmosphere that is stratified in temperature, with warmer layers higher up and cooler layers farther down. ... The thermosphere is the layer of the Earths atmosphere directly above the mesosphere and directly below the exosphere. ... The exosphere (from the Greek words exo = out(side) and sphaira = ball) is the uppermost layer of the atmosphere. ...

  Tropopause | Stratopause | Mesopause | Exobase   The tropopause is a boundary region in the atmosphere between the troposphere and the stratosphere. ... The stratopause is the level of the atmosphere which is the boundary between the stratosphere and the mesosphere. ... The mesosphere (from the Greek words mesos = middle and sfaira = ball) is the layer of the Earths atmosphere that is directly above the stratosphere and directly below the thermosphere. ... The exosphere (from the Greek words exo = out(side) and sphaira = ball) is the uppermost layer of the atmosphere. ...

  Ozone layer | Turbopause | Ionosphere   The ozone layer, or ozonosphere layer (rarely used term), is the part of the Earths atmosphere which contains relatively high concentrations of ozone (O3). ... The turbopause marks the altitude in the Earths atmosphere below which turbulent mixing dominates. ... Relationship of the atmosphere and ionosphere The ionosphere is the part of the atmosphere that is ionized by solar radiation. ...


  Results from FactBites:
 
Mesosphere (149 words)
The mesosphere (literally middle sphere) is the third highest layer in our atmosphere, occupying the region 50 km to 80 km above the surface of the Earth, above the troposphere and stratosphere, and below the thermosphere.
Temperatures in the mesosphere drop with increasing altitude to about -100°C. The mesosphere is the coldest of the atmospheric layers.
The mesosphere is also the layer in which a lot of meteors burn up while entering the Earth's atmosphere.
  More results at FactBites »

 
 

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